1. A good, kind-hearted person (often a girl), or to be good and kind-hearted
2. Rather or quite
3. Normal/usual (opposite of uncanny)
4. A variant of cannae, cannee, which is a way of saying "can not" (particularly with a Scottish accent)

1. She's a canny lass
2. That's canny good
3. A hoodie and jeans are a canny combination
4. I canny do it!